Synthesis and evaluation of antibacterial and antifungal activities of new (Z)-3-bromo-4-(1,3-diaryl-1H-pyrazol-4-yl)but-3-en-2-ones and 4-(3-methyl-1-phenyl-1H-pyrazol-5-yl)-1,3-diaryl-1H-pyrazoles
作者:Rashmi Pundeer、Sushma、Vijay Kiran、Chetan Sharma、K. R. Aneja、Om Prakash
DOI:10.1007/s00044-013-0480-0
日期:2013.10
Bromination of 4-(1, 3-diaryl-1H-pyrazol-4-yl) but-3-en-2-ones, triggered by a combination of potassium bromide and cerium(IV) ammonium nitrate in a biphasic system consisting of water and dichloromethane furnishes the corresponding monobromo compounds 2 directly, instead of the expected dibromo compounds. The α-bromo compounds 2 were utilized as efficient precursors for the synthesis of several bipyrazolyl
在由以下组成的双相系统中,溴化钾和硝酸铈(IV)铵的组合引发4-(1,3-二芳基-1 H-吡唑-4-基)but-3-en-2-one的溴化反应水和二氯甲烷直接提供相应的一溴化合物2,而不是预期的二溴化合物。α-溴化合物2被用作合成几种联吡唑基衍生物,4-(3-甲基-1-苯基-1 H-吡唑-5-基)-1、3-二芳基-1 H-吡唑的有效前体(3)。所有的α-溴代烯酮2和联吡唑3是新化合物,它们的身份由mp,光谱和分析数据确定。测试了新产品2和3的体外抗菌活性金黄色葡萄球菌,枯草芽孢杆菌(革兰氏阳性),大肠杆菌和铜绿假单胞菌(革兰氏阴性)以及对黄曲霉和黑曲霉的抗真菌活性。将测试化合物的抗菌活性与市售抗生素环丙沙星和抗真菌药氟康唑进行了比较。